HUAWEI UA5000 HABD board CSRB

The CSRB board is a 32-channel POTS and ADSL2+ combo service board with a built-in 600-ohm impedance splitter and protection circuit.

• The broadband services are transmitted to the broadband control board through the broadband bus, and the broadband control board transmits the services upstream to the IP network.
• The narrowband services are transmitted to the narrowband control board through the HW bus, and the narrowband control board transmits the services upstream to the PSTN network.
• The CSRB board adopts the external ringing, that is, the unbalanced ringing mode.
• The broadband and narrowband line capture tests are implemented by the transfer board. The narrowband service supports the loop-line capture test
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Narrowband services of the CSRB board

The CSRB board provides the broadband and narrowband service processing functions to implement 32 channels of ADSL2+ and POTS services. The basic working principles of the CSRB board are as follows:

The broadband service processing includes the following:

• The broadband service control module controls and manages the broadband services.
• The bus conversion module performs the conversion between the broadband bus of the backplane and the broadband bus of the board.
• The digital processing module, the analog front-end module, and the line amplifier module implement the coding/decoding, analog-digital conversion, and line driving for the ADSL2+ service. The upstream port is connected to the broadband bus of the backplane.

The narrowband service processing includes the following:

• The narrowband service control module controls and manages the narrowband services.
• The codec module and the line interface module implement the coding/decoding, analog-digital conversion, and 2/4-wire conversion for the narrowband voice service. The upstream port is connected to the narrowband bus of the backplane.

The splitter module couples broadband and narrowband subscriber lines.